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To avoid an impact on the schedule, the delay was absorbed by conducting several activities normally performed after Plan X: secondary propulsion system (SPS) modules fit check and alignment, SPS heatshield fit check, and booster adapter fit check. But the vehicle work plan was again rescheduled, and Plan X did not begin until June 7. Following the successful completion of Plan X on June 8, the vehicle was returned to Hanger E for systems verification tests, which began on June 9. Cause of rescheduling was the Gemini IX-A launch.